I tried the tower mount and didn't like it. Four basic problems:
1) As Roddyrod said, the view angle is wrong, especially if you want the video to look impressive
2) The camera always lags the rider. If you are zoomed out so that you can see half the wake it isn't so much of a problem, but if you are zoomed in to get a better shot of the rider he will never be framed properly. The problem is that when the rider makes his cut and starts moving across the wake the "slop" in the system plus the slight curve in the rope leaves the camera centered on where the rider just was instead of where he is.
3) Slack in the line really jerks the camera around. Not much of a problem on simple wake to wake tricks but when the rider gives the rope a good yank to execute a 540 the shock wave travels up the rope and the camera jerks all over the place.
4) It is a real bitch to operate the camera, especially if you have the bimini up. The sun washes out the display so it is hard to tell what the camera is actually seeing. Life is a little better if you have a remote LCD monitor and a remote control so that you can see and control from the observers seat.